ANTIQUE
GLOBES, SURVEYING and DRAWING INSTRUMENTS for sale
A
very rare antique gun metal mining dial / theodolite engraved
on the body “THE THORNTON DIAL”
in it's original fitted, mahogany case with
short and extended legs which screw together and fit
in the socket beneath the dial.
The
instrument was patented by Thornton and is best
described in the Thornton illustrated catalogue. The
instrument comes in its original mahogany case with brass hinges & catches
and makers trade plate inside the lid. A military
arrow on the instrument suggests this instrument was once owned and used by the
army in the first few years of the 19th century. An excellent example
of this rare innovative mining dial from one of the best English instrument
makers. -
£750
A
fine antique THEODOLITE by G & M Simons,
London. This
theodolite is engraved in script on the silvered
compass dial, “G & m Simons, 49 King St.
London”. The instrument
stands 9 inches high and comes with its accessories
in its original fitted mahogany case with mahogany
inserts to hold the instrument in place in transit. The removable and reversible
telescope, which extends from just under 10½ inches to just over 11 1/2 inches
when fully open, has thumbwheel rack & pinion
focussing, draw out focussing eyepiece to bring the internal cross hairs into or
out of focus, a bubble level, and an
erecting eyepiece as well as the conventional inverting eyepiece . The telescope tube rests on a cradle and is held in place by two shaped
clamp bars secured by its original pins. The cradle is raised by two A-frame
supports and incorporates a vertical half-circle. The
vertical half circle has a vernier to the scales and there is also a scale
reading 30-0-30 on the reverse
of the vertical circle engraved Diff of Hypo and Base. The horizontal circle
incorporates a raised and glazed brass compass box, showing the cardinal points.
The outer compass scale is graduated counter-clockwise 0-360 degrees. The shaped
blue-steel needle has a brass cap and a working needle clamp. The
horizontal scale has a pair of verniers with swinging scale microscope, fine
adjust and two horizontal bubble levels on the plate. All this is mounted on a
complex four-screw mount with fine adjustment and
clamp. The
fitted mahogany case
has brass catches and hinges, and handmade dovetail joints. This is
a rare theodolite, by a London manufacturing company of the mid 19th century,
supplying only the best instruments. This
theodolite is in good working condition with most of its original lacquer and
makes a fine display. - £750
A
fine antique mining dial/theodolite in its original fitted
mahogany case, engraved on the silver compass dial
JOHN DAVIS & SON, (DERBY) Ltd, and with the
serial number 4342, in its original case.
The horizontal silver compass has a thumbscrew needle clamp, is scaled 0
– 360 degrees on the outside, has four 0 – 90 degree scales on the inside
and a pair of working bubble levels inset. The
instrument has a thumbwheel underneath with which to
turn the dial horizontally, a clamping screw to fix the horizontal position, a
fine position control and a silvered vernier on the
side of the compass box for accurate reading. The instrument is fitted with a vertical
dial (effectively making it a mining theodolite). It comes with its original
case, which has brass clips & hinges. The
instrument is in good condition with lots of original lacquer left and makes a
very impressive display as well as being a rare working antique instrument -
£395
A
transit theodolite
engraved on the baseplate COOK,
TROUGHTON & SIMMS Ltd. YORK, ENGLAND No. 37084, in its original
case. The telescope has rack & pinion focussing and a pair of hinged
filters. The exposed vertical circle has 2 verniers
with silvered scales, clamp with micrometer fine adjust and a bubble level.
The enclosed horizontal silvered scale has 2 silvered verniers
and a horizontal bubble level on the plate. All this is
mounted on a three screw levelling mount with fine
adjust and clamp. The instrument, which has all original finishes, is in good
working condition, although the cosmetic finish leaves something to be desired,
and comes in it's original transit case
which is made from mahogany and has brass catches and hinges.
- £295
The World's Minerals
(with 40 colored plates) by L.J.Spencer
- £15
last updated 07/12/2012